This is a smokescreen. It is also false.
The same rights and liberties are available to everybody. The idea that married people get some sort of special break is not true. Nor is the idea that homosexuals, being unable (or unwilling) to marry a person of the opposite sex, somehow have some financial disadvantage. Rights of inheritance, the ability to visit somebody in the hospital, and familial relationships can be established without marriage by the use of legal methods already in existence, such as adult or virtual adoption, trusts, corporations, partnerships, etc.
Unfortunately the real goal is to destroy marriage as an institution. Sort of like the naughty child breaking things that other people have, because they don't have one.
Even more unfortunately, these petulant children are grown up and can do some real damage by co-opting sleazy politicians and lazy or sympathetic clerics.
That is what is in dispute, isn't it. They say they want the same liberties as everyone else. You say they want to destroy marriage as an institution. My understanding is that they do not believe that the legal options already in existence are fair. Trying to prove that their real agenda is to destroy the institution of marriage will take more than hatred - it will take real evidence.